Where is and how do I check Blend door on my dodge ram 1996?

Where is and how do I check Blend door on my dodge ram 1996?
The blend door actuator motor is located on the bottom of the plenum box on the passenger side towards the transmission tunnel. It is easy to remove and examine the motor to blend door connection. The blend door on the Ram is made of metal and seldom breaks. The problem is more likely the plastic interposer that spans between the metal drive motor connection the the metal axle. Check Ebay listings for HeaterTreater to find the Ram and a 100% solution and more diagnostic information.